// equalshashcode/MapEntry.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// A simple Map.Entry for sample Map implementations

import java.util.Map;
import java.util.Objects;

public class MapEntry<K, V> implements Map.Entry<K, V> {
    private K key;
    private V value;

    public MapEntry(K key, V value) {
        this.key = key;
        this.value = value;
    }

    @Override
    public K getKey() {
        return key;
    }

    @Override
    public V getValue() {
        return value;
    }

    @Override
    public V setValue(V v) {
        V result = value;
        value = v;
        return result;
    }

    @Override
    public int hashCode() {
        return Objects.hash(key, value);
    }

    @SuppressWarnings("unchecked")
    @Override
    public boolean equals(Object rval) {
        return rval instanceof MapEntry &&
                Objects.equals(key,
                        ((MapEntry<K, V>) rval).getKey()) &&
                Objects.equals(value,
                        ((MapEntry<K, V>) rval).getValue());
    }

    @Override
    public String toString() {
        return key + "=" + value;
    }
}
